Magnetic separator.



R. D. PKE.

MAGNETIC SEPARATOB.

/uPPLlcATloN FILED 111111.13. 1916.

INVENTOR. .@wm

f1.1 ATTORNEYS,

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ROBERT D. PIKE, @ESAN FRAN CISCO, CALIFORNIA.

Maenn'rrc snranaron.

Specication of Letters Patent.

patented .may at, lait..

Application led March 13, 1916. Serial No. 83,765.

To all whom it may concern:

Be it known that I, ROBERT D. PIKE, a4

ings, etc.

'llhe object 'of the invention is to provide a machine, of the type described, of the greatest possible efficiency, and at the same time of slmple and cheap construction. To this end a continuous closed magnetic field is maintained, and the material to be separated is passed therethrough, in proximlty to both poles of the magnet, in the manner hereinafter fully described.

In order to comprehend the invention, reference should be had to the. accompany: ing drawin wherein- Figurel 1s a transverse part-sectional ele-v vation of the separator.

Fig. 2 is a part sectional plan view.

Fig. 3 is aside elevation, reduced in size, showing the Aexterior arrangement of the feed and discharge conduits.

ln the drawin the reference numeral 1 designates a cylis drical shell, preferably formed of non-manetic material. An axially disposed shaf 2 is rotatably mounted within said shell 1, and carriesa pair of spaced armature disks 3, formed preferably of soft iron. Said armature disks are mounted upon a centrally-disposed magnetic sleeve 4, which surrounds a non-magnetic bushing 5 immediately surrounding the shaft 2. The armature disks 3 are spaced upon said sleeve 4 by a non-magnetic spacing disk 6, and non-magnetic end plates 7, clam ed together by through bolts'S, are employe to hold the entire rotating structure together. Suitable means are provided for rotating the shaft 2 and the structure mounted4 thereon, as, for example, a belt pulley 9.

'I The diameter of the spacer 6 and the end plates 7 is very nearly as great as the interior diameter of the shell 1, so that a bare clearance is left between said shell and they periphery of said spacer and end plates.

The armature disks 3 are of less diameter than said spacer and end plates, thus forming a pair of annular circumferential channels 10 in thev rotor, and the peripheral surfaces of said armature disks 3 are preferably toothed or serrated, as shown at 11, for a purpose hereinafter set forth.

Beside the `shell 1 is mounted a pair of magnets 12, shown in the drawings as electro-magnets, the cores 13 of which are connected at their outer ends by a magnetic -bar 14, and are formed'with pole shoes 15 at theirfinner ends, said pole shoes 15 being positioned immediatelyl outside the shell 1 in radial alinement with the armature disks 3 ofthe rotor. A substantially closed path is thus provided for the magnetic fiux, comprisin the magnet cores 13, the pole shoes 1,5, t e armature disks 3, the sleeve 4, and the bar 14:.

The material to be separated is introduced into the u per portions ofthe annular grooves or c annels 10 through a bifurcated manifold 16, Fig. 3 of the drawings, and, guided by deflector plates 17, Fig. 1, falls yupon the serrated peripheral surfaces ofthel armature disks 3, and is carried around by the rotation of said armature disks, in the direction of the arrow, into the region of the pole shoes 15. Here said material enters the,

magnetic field, and any iron or other magnetlc particles are at once attracted. to and held against the armaturedisks 3, while-the non-magnetic particles are carried around as ,an outer layer overlying the magnetic material. A series of bame plates 18, formed preferably of non-magnetic material, lare fixed to and project inwardly from the shell V1, against which the outer layer of material impinges and by which it is agitated and ,stirred up, so that complete separation of the magnetic and non-magnetic portionsof said material is'effected.

When the material passes' the lower'most of said baille plates 18, the non-magnetic portions thereof fall into discharge chutes 19, and are carried off in any lconvenient manner, not shown in the drawings. The magnetic'portions of said material adhere to the armature disks 3 until carried beyond the lower end of the pole shoes 15, and therefore out of the magnetic field. The heavier particles thereupon drop into the discharge chutes 20,'and any material which' still adheres to the surfaces of said arma` 4 ture disks 3 is removed therefrom by brushes 21, and falls into said discharge chutes 20.

` The brushes .21 are 'preferably mounted shell 1, and this difference' in eld strength being enhanced by the serrated contour of said armature surfaces, the effect is to concentrate the lines of magnetic force at the i through the separator to adhere to the sur,

points of the teeth, and to cause the magnetic particles in the material passed faces of the armature disks 3, and not bel drawn away therefrom toward the shell l.

By providing a substantially closed magn tic circuit, there is obtained the greatest possible field strength between the pole shoes 15 and the armature disks 3, and thereby the highest possible efficiency. Moreover, the magnetic leakage from said circuitis very slight, so that the portions of the armature disks lying outside the direct path of the magnetic flux have little or no attraction for the magnetic particles of the separated material, and the discharge-` of said magnetic particles is .thereby facilitated.

It is not my intention to limit myself to the form and construction of the device herein illustrated and described otherwise than as expressly recited in the .claims hereto appended, for the reason that many changes may be made therein withoutv departing from the spirit of the invention.' On the contrary, I wish to be understood as claiming the invention as broadlyl as the art will permit.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is A magnetic separator comprising `a stationary substantiall cylindrical non-magnetic shell; a pair o spaced'electro-magnets positioned side-by-side outside said shell and having. their cores disposed radially with respect thereto; a magnetic bridge joining the outer ends of said cores; circumferentially elongated pole shoes carried by the inner ends of said cores and lying adjacent the sidel of the shell; an axially disposed shaft rotatably mounted within said shell, a non-magnetic core surrounding said shaft', a magnetic sleeve surrounding said core, and a pair of substantially cylindrical armature disks, having transversely serrated peripheral surfaces, mounted upon said sleeve and positioned in transverse alinement with said pole shoes, whereby said magnet cores and their bridge, said armatures, and said sleeve form a substantially closed magnetic circuit; a non` magnetic spacer disk mounted upon said shaft between said armatures, and nonmagnetic guide disks similarly mounted adjacent the outer end faces of -said armatures, said spacer and guide disks being of greater diameter than' said armatures; means for feeding the material to be separated into Said shell; interior baile plates for agitating said material and directing the same onto the peripheral surfaces of said armatures; means for discharging the separated material; and mechanism for rotating said shaft to cause said armatures tzo ltirry said material through the magnetic In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROBERT D PIKE.

Witnesses N. A. AGKER, D. B. RICHARDS. 

